#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;

class Date
{
	friend ostream& operator<<(ostream& out, const Date& d);
	friend istream& operator>>(istream& in, Date& d);
public:
	bool CheckDate() const;

	Date(int year = 1000, int month = 1, int day = 1);
	void Print();

	int GetMonthDay(int year, int month) const
	{
		static int monthDayArray[] = { -1,31,28,31,30,31,30,
		31,31,30,31,30,31 };
		if (month == 2 && ((year % 4) == 0 && year % 100 != 0) || (year % 400 == 0))
		{
			return 29;
		}
		return monthDayArray[month];
	}

	bool operator<(const Date& d) const;
	bool operator<=(const Date& d) const;
	bool operator>(const Date& d) const;
	bool operator>=(const Date& d) const;
	bool operator==(const Date& d) const;
	bool operator!=(const Date& d) const;

	Date operator++(int);

	Date& operator++();

	Date operator--(int);

	Date& operator--();

	Date operator+(int day) const;
	Date& operator+=(int day);

	Date operator-(int day) const;
	Date& operator-=(int day);

	int operator-(const Date& d) const;

	Date* operator&()
	{
		return this;
		//return nullptr;
		//return (Date*)0x2673FF40;
	}

	const Date* operator&() const
	{
		return this;
		//return nullptr;
		//return (Date*)0x2673FE30;
	}

private:
	int _year;
	int _month;
	int _day;
};

ostream& operator<<(ostream& out, const Date& d);
istream& operator>>(istream& in, Date& d);